Voltage conversion module, power supply system and related devices

Abstract

The application provides a voltage conversion module, a power supply system and related equipment, wherein the voltage conversion module comprises a first voltage conversion unit and n second voltage conversion units, n is a positive integer; the first voltage conversion unit comprises a switching unit and a resonance unit, the resonance unit is electrically connected with the switching unit, the switching unit comprises two groups of power switches, the on-off states of the two groups of power switches are opposite, the resonance unit is used for obtaining a negative voltage through a group of power switches that are turned on, and then converting the negative voltage into a first positive voltage; n second voltage conversion units are electrically connected with the resonance unit, each second voltage conversion unit in the n second voltage conversion units is used for receiving the first positive voltage and adjusting the first positive voltage into a second positive voltage. The voltage conversion module, the power supply system and the related equipment provided by the application can reduce the power parameters of the power switches, thereby improving the power supply efficiency and increasing the power density, reducing the cost and the supply risk.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit, and in particular, to a voltage conversion module, a power supply system and related equipment. BACKGROUND

[0002] With the rapid development of wireless communication, especially the advent of the fifth generation mobile communication technology (5 th Generation mobile communication technology, 5G), the application of distributed power supply architecture is becoming more and more widespread. The commonly used distributed power supply architectures at present are direct current-return common (DC-C) and direct current-return isolate (DC-I).

[0003] Among them, as FIG. 1A shown, the DC-C power supply mode is multi-point grounding, and the circuit does not involve an isolation module (such as a transformer). The BUCK-BOOST circuit is often used in the DC-C power supply system to convert the-48V DC voltage into a suitable positive voltage (such as +28V, +50V, etc.). The DC-I power supply mode is an isolated single-point grounding power supply, and the circuit involves an isolation module (such as a transformer), that is, the DC-I power supply system can increase the isolation module before the DC-C power supply system. In this way, the DC-I power supply system can borrow the BUCK-BOOST circuit of the DC-C power supply system and does not need to be redeveloped. However, the DC-I power supply system needs to reserve a position for the isolation module before the BUCK-BOOST circuit of the DC-C power supply system, and through the selection of a straight-through connector or an isolation module, the compatibility of the DC-C power supply mode and the DC-I power supply mode is realized. That is, this distributed power supply architecture needs to spare the area for setting the isolation module, which is not conducive to realizing high power density.

[0004] In addition, if it is necessary to realize voltage conversion and closed-loop control by using the BUCK-BOOST circuit, it is required that the BUCK-BOOST circuit uses a switching device with a large power parameter. For example, as FIG. 1B shown, in the case of input-48V DC and output+50V DC, when the power switch S is turned off, the voltage (i.e., the drain-source voltage) applied to the power switch S in the BUCK-BOOST circuit can reach 98V, which is much higher than the input voltage value. Therefore, in order to make the BUCK-BOOST circuit work normally, the BUCK-BOOST circuit needs to use a power switch with a withstand voltage value higher than 98V, rather than a power switch with a withstand voltage value close to 48V. This will result in low voltage conversion efficiency, large power loss, and large occupied area of the BUCK-BOOST circuit, which is not conducive to realizing high power supply efficiency and high power density. SUMMARY

[0005] Therefore, the application provides a voltage conversion module, a power supply system and related devices, which can reduce the power parameters of the switching devices, thereby improving the power supply efficiency and increasing the power density, reducing the cost and supply risk.

[0006] In a first aspect, the application provides a voltage conversion module, comprising a first voltage conversion unit and n second voltage conversion units, n being a positive integer. The first voltage conversion unit comprises a switching unit and a resonance unit, the switching unit comprising two groups of power switches, the on-off states of the two groups of power switches being opposite, the resonance unit being electrically connected with the switching unit, for obtaining a negative voltage through a group of power switches that is turned on, and then converting the negative voltage into a first positive voltage. The n second voltage conversion units are electrically connected with the resonance unit, each of the n second voltage conversion units being configured to receive the first positive voltage and adjust the first positive voltage into a second positive voltage.

[0007] By adopting the embodiments of the application, the voltage conversion module is provided with the first voltage conversion unit and the n second voltage conversion units, the switching unit and the resonance unit of the first voltage conversion unit are used to convert the voltage polarity of the negative voltage, and then the n second voltage conversion units are used to boost or buck the voltage. Based on such a design, the voltage values borne by the switching devices in the first voltage conversion unit and the switching devices in the second voltage conversion units are both less than the sum of the input voltage value and the output voltage value. FIG. 1B The voltage value borne by the power switch S in the BUCK-BOOST circuit shown in the figure when it is turned off is the sum of the input voltage value and the output voltage value. Obviously, compared with the BUCK-BOOST circuit shown in the figure, FIG. 1B Compared with the BUCK-BOOST circuit shown in the figure, the voltage values borne by the power switches in the first voltage conversion unit and the n second voltage conversion units of the application are smaller. This makes the power parameters of the switching devices used in the first voltage conversion unit and the n second voltage conversion units reduced. Since the switching devices with small power parameters are superior to the switching devices with large power parameters in performance, which can be reflected in fast response speed, small loss, small size, low cost and small supply risk, the power supply efficiency and the power density of the entire voltage conversion module can be effectively improved, and the cost and supply risk can be reduced.

[0008] In a possible design, the switch unit includes a first power switch, a second power switch, a third power switch, and a fourth power switch connected in series in sequence, and the resonant unit is connected in parallel with the second power switch and the third power switch in series. A middle node of the second power switch and the third power switch and one end of the fourth power switch are used to receive a negative voltage, one end of the first power switch is used to connect the second voltage conversion unit to output a first positive voltage to the second voltage conversion unit. The first power switch and the third power switch constitute one of the two groups of power switches, the second power switch and the fourth power switch constitute the other group of power switches, the resonant unit is used to obtain the negative voltage through the turned-on second power switch and the fourth power switch and charge, and the resonant unit is also used to discharge to the second voltage conversion unit through the turned-on first power switch and the third power switch. Based on such a design, the first voltage conversion unit constitutes a non-isolated resonant switched capacitor circuit, and a DC-C power supply mode can be implemented. Moreover, the voltage borne by the group of switch devices in the first voltage conversion unit is only the input voltage, which makes the first voltage conversion unit be able to select appropriate small power parameter switch devices, without using large power parameter switch devices, which is beneficial to improve the efficiency and power density of the whole voltage conversion module, reduce the cost and supply risk. Moreover, the first voltage conversion unit does not need to be provided with a transformer, and the cost is further reduced.

[0009] In a possible design, the switch unit includes a first power switch, a second power switch, a third power switch and a fourth power switch connected in series in sequence, the resonance unit includes a resonance capacitor and a resonance inductor, the resonance capacitor is connected in parallel with the second power switch and the third power switch in series, one end of the resonance inductor is connected to a middle node of the second power switch and the third power switch, and the other end is electrically connected to one end of the first power switch connected to the second voltage conversion unit. The middle node of the second power switch and the third power switch and one end of the fourth power switch are used to receive a negative voltage, and one end of the first power switch is used to connect the second voltage conversion unit to output a first positive voltage to the second voltage conversion unit. The first power switch and the third power switch constitute one of the two groups of power switches, the second power switch and the fourth power switch constitute the other group of power switches, and the resonance unit is used to obtain the negative voltage through the turned-on second power switch and fourth power switch and charge. The resonance unit is also used to discharge to the second voltage conversion unit through the turned-on first power switch and third power switch. Based on such a design, the first voltage conversion unit constitutes a non-isolated resonant switched capacitor circuit, and a DC-C power supply mode can be realized. Moreover, the voltage borne by the group of switch devices in the first voltage conversion unit is only the input voltage, which makes the first voltage conversion unit be able to select appropriate small power parameter switch devices, without using large power parameter switch devices, which is beneficial to improve the efficiency and power density of the whole voltage conversion module, reduce the cost and supply risk. Moreover, the first voltage conversion unit does not need to be provided with a transformer, and the cost is further reduced.

[0010] In a possible design, the switching unit includes a first power switch, a second power switch, a third power switch, and a fourth power switch, the first power switch and the second power switch are connected in series, the third power switch and the fourth power switch are connected in series, and the first power switch and the second power switch connected in series are connected in parallel with the third power switch and the fourth power switch connected in series. One end of the first power switch connected to the third power switch and one end of the second power switch connected to the fourth power switch are configured to receive a negative voltage. The resonant unit includes a transformer and a resonant network, one end of the transformer is connected to a middle node of the first power switch and the second power switch and a middle node of the third power switch and the fourth power switch through the resonant network, and the other end of the transformer is configured to be electrically connected to the second voltage conversion unit to output a first positive voltage to the second voltage conversion unit. The first power switch and the fourth power switch constitute one of two groups of power switches, the second power switch and the third power switch constitute the other group of power switches, and the resonant network is configured to obtain the negative voltage through the first group of power switches turned on or the second group of power switches turned on, and then transmit electric energy to the second voltage conversion unit through the transformer. Based on such a design, the first voltage conversion unit constitutes an isolated resonant full-bridge circuit, and a DC-I power supply mode can be implemented. Moreover, the voltage borne by the group of switching devices in the first voltage conversion unit is only the input voltage, which makes the first voltage conversion unit be able to select appropriate switching devices with small power parameters, without the need to use switching devices with large power parameters, which is conducive to improving the efficiency and power density of the entire voltage conversion module, reducing the cost and supply risk.

[0011] In a possible design, the switch unit includes a first power switch, a second power switch, a first capacitor, and a second capacitor. The first power switch and the second power switch are connected in series, and the first capacitor and the second capacitor are connected in series. The first power switch and the second power switch connected in series are connected in parallel with the first capacitor and the second capacitor connected in series. One end of the first power switch connected to the first capacitor and one end of the second power switch connected to the second capacitor are configured to receive a negative voltage. The resonance unit includes a transformer and a resonance network. One end of the transformer is connected to a middle node of the first power switch and the second power switch and a middle node of the first capacitor and the second capacitor through the resonance network, and the other end of the transformer is configured to be electrically connected to the second voltage conversion unit to output a first positive voltage to the second voltage conversion unit. The first power switch and the second capacitor form one of two groups of power switches, and the second power switch and the first capacitor form the other of the two groups of power switches. The resonance network is configured to obtain the negative voltage through the first group of power switches that are turned on or the second group of power switches that are turned on, and then transmit electric energy to the second voltage conversion unit through the transformer. Based on this design, the first voltage conversion unit forms an isolated resonant half-bridge circuit, and can implement a DC-I power supply mode. Moreover, the voltage borne by one group of switch devices in the first voltage conversion unit is only the input voltage, so that the first voltage conversion unit can select appropriate switch devices with small power parameters, without using switch devices with large power parameters, which is beneficial to improving the efficiency and power density of the voltage conversion module, reducing the cost and supply risk.

[0012] In a possible design, the working state of the first voltage conversion unit is an open-loop working state. When the first voltage conversion unit is in the open-loop working state, the duty cycle of the power switch in the first voltage conversion unit is fixed, and the first voltage conversion unit outputs a first positive voltage with a fixed voltage value. Based on this design, the first voltage conversion unit has no voltage regulation process, so that the conversion efficiency of the voltage conversion module is high. The working state of the second voltage conversion unit is a closed-loop working state. When each second voltage conversion unit is in the closed-loop working state, the duty cycle or the frequency of the power switch in each second voltage conversion unit is adjustable, and each second voltage conversion unit outputs a second positive voltage with an adjustable voltage value. Based on this design, the n second voltage conversion units can be regulated by voltage feedback, so that the voltage conversion module can output an accurate voltage value.

[0013] In a possible design, the voltage conversion module further includes a centralized control unit. The centralized control unit is electrically connected to the first voltage conversion unit and each of the second voltage conversion units. The centralized control unit is configured to open-loop control the first voltage conversion unit to output the first positive voltage and close-loop control each of the second voltage conversion units to output the second positive voltage. With this design, the first voltage conversion unit and the n second voltage conversion units can be controlled by the centralized control unit, which can reduce the number of control units in the voltage conversion module, and facilitate reduction in size and improvement in integration of the voltage conversion module, and reduction in cost.

[0014] In a possible design, the voltage conversion module further includes a first control unit and a centralized control unit. The first control unit is electrically connected to the first voltage conversion unit, and is configured to open-loop control the first voltage conversion unit to output the first positive voltage. The centralized control unit is electrically connected to the second voltage conversion units, and is configured to close-loop control each of the second voltage conversion units to output the second positive voltage. With this design, the n second voltage conversion units can be controlled by the centralized control unit, which can reduce the number of control units in the voltage conversion module, and facilitate reduction in size and improvement in integration of the voltage conversion module. In addition, the first voltage conversion unit and the second voltage conversion units are controlled separately, which can improve reliability of the first voltage conversion unit and the second voltage conversion units.

[0015] In a possible design, the first voltage conversion unit includes a first control unit and m second control units, where m is a positive integer and m is less than or equal to n. The first control unit is electrically connected to the first voltage conversion unit, and is configured to open-loop control the first voltage conversion unit to output the first positive voltage. The m second control units are respectively electrically connected to the corresponding one of the n second voltage conversion units, and are respectively configured to close-loop control the corresponding one of the n second voltage conversion units to output the second positive voltage. With this design, the first voltage conversion unit and each of the n second voltage conversion units are controlled separately, which can improve reliability of the first voltage conversion unit and the n second voltage conversion units.

[0016] In a possible design, each of the n second voltage conversion units includes a boost conversion circuit, a buck conversion circuit, and / or a buck-boost conversion circuit. With this design, the n second voltage conversion units can flexibly select appropriate circuits to implement the boost and / or buck functions, so as to generate a required voltage value.

[0017] In a possible design, the voltage conversion module further includes a first control unit and a centralized control unit. The first control unit is electrically connected to the first voltage conversion unit, and is configured to open-loop control the first voltage conversion unit to output the first positive voltage. The centralized control unit is electrically connected to the second voltage conversion units, and is configured to close-loop control each of the second voltage conversion units to output the second positive voltage. With this design, the n second voltage conversion units can be controlled by the centralized control unit, which can reduce the number of control units in the voltage conversion module, and facilitate reduction in size and improvement in integration of the voltage conversion module. In addition, the first voltage conversion unit and the second voltage conversion units are controlled separately, which can improve reliability of the first voltage conversion unit and the second voltage conversion units.

[0015] In a possible design, the first voltage conversion unit includes a first control unit and m second control units, where m is a positive integer and m is less than or equal to n. The first control unit is electrically connected to the first voltage conversion unit, and is configured to open-loop control the first voltage conversion unit to output the first positive voltage. The m second control units are respectively electrically connected to the corresponding one of the n second voltage conversion units, and are respectively configured to close-loop control the corresponding one of the n second voltage conversion units to output the second positive voltage. With this design, the first voltage conversion unit and each of the n second voltage conversion units are controlled separately, which can improve reliability of the first voltage conversion unit and the n second voltage conversion units.

[0016] In a possible design, each of the n second voltage conversion units includes a boost conversion circuit, a buck conversion circuit, and / or a buck-boost conversion circuit. With this design, the n second voltage conversion units can flexibly select appropriate circuits to implement the boost and / or buck functions, so as to generate a required voltage value.

[0017] In a possible design, the voltage conversion module further includes a first control unit and a centralized control unit. The first control unit is electrically connected to the first voltage conversion unit, and is configured to open-loop control the first voltage conversion unit to output the first positive voltage. The centralized control unit is electrically connected to the second voltage conversion units, and is configured to close-loop control each of the second voltage conversion units to output the second positive voltage. With this design, the n second voltage conversion units can be controlled by the centralized control unit, which can reduce the number of control units in the voltage conversion module, and facilitate reduction in size and improvement in integration of the voltage conversion module. In addition, the first voltage conversion unit and the second voltage conversion units are controlled separately, which can improve reliability of the first voltage conversion unit and the second voltage conversion units.

[0015] In a possible design, the first voltage conversion unit includes a first control unit and m second control units, where m is a positive integer and m is less than or equal to n. The first control unit is electrically connected to the first voltage conversion unit, and is configured to open-loop control the first voltage conversion unit to output the first positive voltage. The m second control units are respectively electrically connected to the corresponding one of the n second voltage conversion units, and are respectively configured to close-loop control the corresponding one of the n second voltage conversion units to output the second positive voltage. With this design, the first voltage conversion unit and each of the n second voltage conversion units are controlled separately, which can improve reliability of the first voltage conversion unit and the n second voltage conversion units.

[0016] In a possible design, each of the n second voltage conversion units includes a boost conversion circuit, a buck conversion circuit, and / or a buck-boost conversion circuit. With this design, the n second voltage conversion units can flexibly select appropriate circuits to implement the boost and / or buck functions, so as to generate a required voltage value.

[0017] In a possible design, the voltage conversion module further includes a first control unit and a centralized control unit. The first control unit is electrically connected to the first voltage conversion unit, and is configured to open-loop control the first voltage conversion unit to output the first positive voltage. The centralized control unit is electrically connected to the second voltage conversion units, and is configured to close-loop control each of the second voltage conversion units to output the second positive voltage. With this design, the n second voltage conversion units can be controlled by the centralized control unit, which can reduce the number of control units in the voltage conversion module, and facilitate reduction in size and improvement in integration of the voltage conversion module. In addition, the first voltage conversion unit and the second voltage conversion units are controlled separately, which can improve reliability of the first voltage conversion unit and the second voltage conversion units.

[0018] In a third aspect, the present application provides a base station comprising the power supply system as above.

[0019] In a fourth aspect, the present application provides a radio frequency module of a base station, comprising a remote radio unit (RRU) and the voltage conversion module as above, the voltage conversion module being electrically connected to the remote radio unit to supply power for the remote radio unit.

[0020] In a fifth aspect, the present application provides a baseband module of a base station, comprising a bandwidth based unit (BBU) and the voltage conversion module as above, the voltage conversion module being electrically connected to the bandwidth based unit to supply power for the bandwidth based unit.

[0021] In addition, the technical effects brought by any possible implementation manner of the second aspect to the fifth aspect can refer to the technical effects brought by different implementation manners of the first aspect, which will not be described here again. BRIEF DESCRIPTION OF DRAWINGS

[0022] FIG. 1A FIG. 1 is a structural schematic diagram of a power supply system.

[0023] FIG. 1B FIG. 2 is a schematic diagram of a BUCK-BOOST circuit. FIG. 1A

[0024] FIG. 2 FIG. 4 is a structural schematic diagram of a voltage conversion module provided by an embodiment of the present application.

[0025] FIG. 3A FIG. 5 is a circuit diagram of one of the implementation manners of the first voltage conversion unit in the voltage conversion module shown in FIG. 4. FIG. 2

[0026] FIG. 3B FIG. 6 is a circuit diagram of another implementation manner of the first voltage conversion unit in the voltage conversion module shown in FIG. 4. FIG. 2

[0027] FIG. 3C FIG. 7 is a circuit diagram of another implementation manner of the first voltage conversion unit in the voltage conversion module shown in FIG. 4. FIG. 2

[0028] FIG. 3D FIG. 8 is a circuit diagram of another implementation manner of the first voltage conversion unit in the voltage conversion module shown in FIG. 4. FIG. 2

[0029] FIG. 4A FIG. 9 is a circuit diagram of one of the implementation manners of the second voltage conversion unit in the voltage conversion module shown in FIG. 4. FIG. 2 FIG. 10 is a circuit diagram of another implementation manner of the second voltage conversion unit in the voltage conversion module shown in FIG. 4.​​​​​

[0030] FIG. 4B for FIG. 2 A circuit diagram of another embodiment of the second voltage conversion unit in the voltage conversion module shown.

[0031] FIG. 4C for FIG. 2 The circuit diagram shows another embodiment of the second voltage conversion unit in the voltage conversion module shown.

[0032] FIG. 5 This is a schematic diagram of the voltage conversion module provided in Embodiment 2 of this application.

[0033] FIG. 6 This is a schematic diagram of the voltage conversion module provided in Embodiment 3 of this application.

[0034] FIG. 7 This is a schematic diagram of the voltage conversion module provided in Embodiment 4 of this application.

[0035] FIG. 8 A schematic diagram of the power supply system provided in this application.

[0036] FIG. 9 This is a schematic diagram of the base station provided in this application.

[0037] FIG. 10 A schematic diagram of the structure of the radio frequency module provided in this application.

[0038] FIG. 11 A schematic diagram of the baseband module provided in this application.

[0039] Explanation of main component symbols

[0040]

[0041] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0042] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0043] It is understood that the connection relationships described in this application refer to direct or indirect connections. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. For example, A can be directly connected to C, and C can be directly connected to B, thus achieving a connection between A and B through C. It is also understood that the "A connects to B" described in this application can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0044] In the description of the present application, unless otherwise specified, " / " means the meaning of "or", for example, A / B can mean A or B. "And / or" herein is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone.

[0045] In the description of the present application, "first", "second", and the like are only used to distinguish different objects, and do not limit the quantity and execution order, and "first", "second", and the like do not necessarily distinguish. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0046] The technical solutions of the present application will be further described in detail below in combination with the drawings.

[0047] With the rapid development of wireless communication, especially the advent of the 5th generation mobile communication technology (5G), the application of distributed power supply architecture is becoming more and more widespread. The commonly used distributed power supply architectures at present are direct current-return common (DC-C) and direct current-return isolate (DC-I).

[0048] Among them, as shown in FIG. 1A DC-C power supply mode is multi-point grounding, and the circuit does not involve an isolation module (such as a transformer). The BUCK-BOOST circuit is often used in the DC-C power supply system to convert the -48V DC voltage into a suitable positive voltage (such as +28V, +50V, etc.). The DC-I power supply mode is isolated single-point grounding, and the circuit involves an isolation module (such as a transformer), that is, the DC-I power supply system can increase the isolation module before the DC-C power supply system. In this way, the DC-I power supply system can borrow the BUCK-BOOST circuit of the DC-C power supply system and does not need to be redeveloped. However, the DC-I power supply system needs to reserve a position for the isolation module before the BUCK-BOOST circuit of the DC-C power supply system, and through the selection of a straight-through connector or an isolation module, the compatibility of the DC-C power supply mode and the DC-I power supply mode can be realized. That is, this distributed power supply architecture needs to spare the area for setting the isolation module, which is not conducive to realizing high power density.

[0049] In addition, if it is necessary to realize voltage conversion and closed-loop control by using the BUCK-BOOST circuit, it is required that the BUCK-BOOST circuit uses a switching device with a large power parameter, for example, as shown in FIG. 1BAs shown, in the case of inputting -48V DC and outputting +50V DC, when the power switch S in the BUCK-BOOST circuit is off, the voltage (i.e. drain-source voltage) applied to the power switch S can reach 98V, which is much higher than the input voltage value. Therefore, in order to make the BUCK-BOOST circuit work normally, the BUCK-BOOST circuit needs to use a switching device with a voltage withstand value higher than 98V, instead of a switching device with a voltage withstand value close to 48V. This will result in low voltage conversion efficiency, large power loss, and large occupied area of the BUCK-BOOST circuit, which is not conducive to achieving high power supply efficiency and high power density.

[0050] Therefore, the embodiments of the present application provide a voltage conversion module, a power supply system and related devices, which can effectively improve the power supply efficiency, increase the power density, and reduce the cost and supply risk.

[0051] The voltage conversion module in the embodiments of the present application will be described in detail below through Examples One to Four.

[0052] Example One:

[0053] Please refer to FIG. 2 , FIG. 2 Fig. 1 shows a schematic diagram of a voltage conversion module provided by Example One of the present application.

[0054] As shown in Fig. 1, the voltage conversion module 1 includes a first voltage conversion unit 10 and n second voltage conversion units 20. Wherein, n can be 1, 2, 3 or other positive integers, which is not limited by the present application. FIG. 2 The first voltage conversion unit 10 can be electrically connected to a negative direct current power supply 2. Further, the first voltage conversion unit 10 can obtain a negative voltage -Vin from the negative direct current power supply 2 and convert the negative voltage -Vin into a first positive voltage +Vo1. Wherein, the negative direct current power supply 2 can be an alternating current / direct current (AC / DC) conversion circuit, which can convert alternating current into negative direct current. The negative direct current power supply 2 can also be a battery (BATT).

[0055] The n second voltage conversion units 20 are all connected to the first voltage conversion unit 10. Thus, each of the n second voltage conversion units 20 can receive the first positive voltage +Vo1 from the first voltage conversion unit 10 and adjust the first positive voltage +Vo1 into a corresponding second positive voltage +Vo2, so as to output the corresponding second positive voltage +Vo2 to the corresponding load 3 to achieve power supply for the load 3.

[0056] Please refer to

[0057] , FIG. 3A , FIG. 3Ais a circuit diagram of the first voltage conversion unit 10. As shown in FIG. 3A The first voltage conversion unit 10 includes a switching unit 101, a resonance unit 102, a first capacitor unit 103, and a second capacitor unit 104.

[0058] The switching unit 101 includes a plurality of power switches. It can be understood that each power switch can be a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), a switching circuit formed by a plurality of MOSFETs in parallel or in series, a switching circuit formed by a plurality of IGBTs in parallel or in series, a switching circuit formed by a MOSFET and a reversed diode in parallel, or a switching circuit formed by an IGBT and a diode in parallel, which is not limited here. For the sake of convenience, the power switch is taken as a switching circuit formed by a MOSFET and a reversed diode in parallel for illustration below.

[0059] As shown in FIG. 3A The switching unit 101 includes four power switches, for example, a first power switch K1, a second power switch K2, a third power switch K3, and a fourth power switch K4. The first power switch K1, the second power switch K2, the third power switch K3, and the fourth power switch K4 are connected in series. Specifically, the source of the first power switch K1 is connected to the drain of the second power switch K2. The source of the second power switch K2 is connected to the drain of the third power switch K3. The source of the third power switch K3 is connected to the drain of the fourth power switch K4. The intermediate node J1 of the second power switch K2 and the third power switch K3 is connected to the source of the fourth power switch K4 for connecting the negative direct current power supply 2 to obtain a negative voltage -Vin. The drain of the first power switch K1 is used as the output terminal of the first voltage conversion unit 10 for connecting the second voltage conversion unit 20 to output a first positive voltage +Vo1 to the second voltage conversion unit 20.

[0060] It can be understood that the gates of the four power switches, i.e., the first to fourth power switches K1-K4, are connected to a control circuit (not shown in the figure) for receiving a control signal to turn on and turn off under the control of the control signal. That is, the on and off states of the first to fourth power switches K1-K4 are configurable. It can be understood that the on and off states of the power switches refer to the on and off states of the switching devices in the power switches.

[0061] The resonance unit 102 is connected in parallel with the second power switch K2 and the third power switch K3 in series. As shown in FIG. 3AAs shown, in some embodiments, the resonance unit 102 includes a resonance capacitor Cr and a resonance inductor Lr. The resonance capacitor Cr and the resonance inductor Lr are connected in series, one end of the resonance capacitor Cr is connected to the intermediate node of the first power switch K1 and the second power switch K2, and one end of the resonance inductor Lr is connected to the intermediate node of the third power switch K3 and the fourth power switch K4.

[0062] The first capacitor unit 103 has two ends connected to the output end of the switch unit 101 (i.e., the drain of the first power switch K1) and the intermediate node J1 between the second power switch K2 and the third power switch K3 (i.e., between the source of the second power switch K2 and the drain of the third power switch K3). The two ends of the second capacitor unit 104 are connected to the positive and negative poles of the negative DC power supply 2.

[0063] It can be understood that the first capacitor unit 103 and the second capacitor unit 104 can each include at least one capacitor, or at least one capacitor and at least one resistor connected in series, which is not specifically limited here. For example, FIG. 3A In some embodiments, the first capacitor unit 103 includes a resistor R1 and a capacitor C1 connected in series, and the second capacitor unit 104 includes a resistor R2 and a capacitor C2 connected in series. The first capacitor unit 103 and the second capacitor unit 104 each have a filtering function, wherein the first capacitor unit 103 is used for filtering the first positive voltage +Vo1. The second capacitor unit 104 is used for filtering the negative voltage -Vin.

[0064] It can be understood that the above-mentioned switch unit 101 and resonance unit 102 can constitute a non-isolated resonant switched capacitor circuit. That is, the switch unit 101 can control the charging and discharging of the resonance unit 102.

[0065] Specifically, when the first voltage conversion unit 10 is working, the first power switch K1 and the third power switch K3 form a group of power switches, and the second power switch K2 and the fourth power switch K4 form another group of power switches. Among them, the on-off states of the power switches in the same group are the same, and the on-off states of the power switches in different groups are opposite. For example, the on-off states of the first power switch K1 and the third power switch K3 in the same group are the same, but the on-off states of the second power switch K2 and the fourth power switch K4 in the other group are opposite.

[0066] For example, in the first time period, the first power switch K1 and the third power switch K3 are turned off, and the second power switch K2 and the fourth power switch K4 are turned on. At this time, the second power switch K2, the resonance unit 102, the fourth power switch K4 and the negative DC power supply 2 form a loop. Based on this, the resonance unit 102 can receive the negative voltage -Vin and charge. In this process, the current will flow through the first capacitor unit 103, so that the first capacitor unit 103 generates and outputs the first positive voltage +Vo1.

[0067] In another example, during the second time period, the first power switch K1 and the third power switch K3 are turned on, and the second power switch K2 and the fourth power switch K4 are turned off. At this time, the first power switch K1, the resonant unit 102, the third power switch K3 and the output terminal form a branch. Based on this, the resonant unit 102 can discharge to the output terminal to maintain the first positive voltage +V01 of the output terminal.

[0068] It can be understood that in the embodiments of the present application, the specific circuit of the first voltage conversion unit 10 is not limited, as long as the first voltage conversion unit 10 can realize the voltage polarity conversion of the obtained negative voltage -Vin. For example, please refer to FIG. 3B In a possible implementation, the first voltage conversion unit 10 can also adopt another non-isolated resonant switched capacitor circuit. As shown in FIG. 3B The first voltage conversion unit 10 includes a switching unit 101, a resonant unit 102a, a first capacitor unit 103 and a second capacitor unit 104.

[0069] It can be understood that the first voltage conversion unit 10 in FIG. 3B is similar to the first voltage conversion unit 10 in FIG. 3A The difference is that FIG. 3B The circuit connection relationship of the first voltage conversion unit 10 in FIG. 3A is different from that of the first voltage conversion unit 10 in FIG. 3B In , the resonant unit 102a includes a resonant capacitor Cr and a resonant inductor Lr, wherein one end of the resonant capacitor Cr is connected to the intermediate node of the first power switch K1 and the second power switch K2, the other end of the resonant capacitor Cr is connected to the intermediate node of the third power switch K3 and the fourth power switch K4, one end of the resonant inductor Lr is connected to the intermediate node J1 of the second power switch K2 and the third power switch K3, and the other end of the resonant inductor Lr is connected to the output terminal of the switching unit 101 through the second capacitor unit 104.

[0070] In another example, please refer to FIG. 3C In another possible implementation, the first voltage conversion unit 10 can also adopt an isolated resonant full-bridge circuit. As shown in FIG. 3C The first voltage conversion unit 10 includes a switching unit 101a, a resonant unit 102b and a rectifier filter unit 105.

[0071] Among them, the switching unit 101a also includes a plurality of power switches, similar to the switching unit 101 in FIG. 3A and FIG. 3B As shown in FIG. 3CAs shown, the switch unit 101a includes four power switches, for example, a first power switch K1, a second power switch K2, a third power switch K3 and a fourth power switch K4. The first power switch K1 and the second power switch K2 are connected in series, and the third power switch K3 and the fourth power switch K4 are connected in series. The first power switch K1 and the second power switch K2 connected in series are connected in parallel with the third power switch K3 and the fourth power switch K4 connected in series. Specifically, the source of the first power switch K1 is connected to the drain of the second power switch K2, and the source of the third power switch K3 is connected to the drain of the fourth power switch K4. The drain of the first power switch K1 is connected to the drain of the third power switch K3, and the source of the second power switch K2 is connected to the source of the fourth power switch K4. The drain of the first power switch K1 and the source of the second power switch K2 are used to connect the positive and negative poles of the negative DC power supply 2, and the drain of the third power switch K3 and the source of the fourth power switch K4 are also used to connect the positive and negative poles of the negative DC power supply 2, so as to obtain the negative voltage -Vin.

[0072] It can be understood that the gates of the first to fourth power switches K1-K4 are used to receive control signals to turn on and turn off under the control of the control signals.

[0073] The resonance unit 102b includes a transformer T and a resonance capacitor Cr, a resonance inductor Lr and an excitation inductor Lm connected in sequence. The resonance capacitor Cr, the resonance inductor Lr and the excitation inductor Lm can constitute a resonance network. One end of the resonance capacitor Cr is connected to the intermediate node of the first power switch K1 and the second power switch K2, and one end of the excitation inductor Lm is connected to the intermediate node of the third power switch K3 and the fourth power switch K4. The excitation inductor Lm is connected in parallel with the primary winding of the transformer T.

[0074] The rectification filter unit 105 includes two diodes VD1, VD2 and a capacitor C4. The two diodes VD1, VD2 are respectively connected across the two ends of the secondary winding of the transformer T to constitute a rectification circuit with rectification function. One end of the capacitor C4 is connected to the center tap of the secondary winding, and the other end is connected to the cathode of the diode VD1 and serves as the output end of the first voltage conversion unit 10 to connect the second voltage conversion unit 20, and further output the first positive voltage +Vo1 to the second voltage conversion unit 20.

[0075] It can be understood that when the first voltage conversion unit 10 works, the first power switch K1 and the fourth power switch K4 constitute a group of power switches, and the second power switch K2 and the third power switch K3 constitute another group of power switches. Among them, the first power switch K1 and the fourth power switch K4 in the same group have the same on-off state, but the on-off state is opposite to that of the second power switch K2 and the third power switch K3 in the other group.

[0076] For example, in the first time period, the first power switch K1 and the fourth power switch K4 are turned on, and the second power switch K2 and the third power switch K3 are turned off. At this time, the first power switch K1, the resonant network, the primary winding of the transformer T, the fourth power switch K4 and the negative DC power source form a loop. Based on this, the resonant network can obtain the negative voltage -Vin, and then transmit the electric energy to the transformer T, and the transformer T transmits the electric energy to the rectifier filter unit 105, so that the rectifier filter unit 105 can output the first positive voltage +Vo1.

[0077] For another example, in the second time period, the second power switch K2 and the third power switch K3 are turned on, and the first power switch K1 and the fourth power switch K4 are turned off. At this time, the second power switch K2, the resonant network, the primary winding of the transformer T, the third power switch K3 and the negative DC power source form a loop. Based on this, the resonant network can obtain the negative voltage -Vin, and then transmit the electric energy to the transformer T, and the transformer T transmits the electric energy to the rectifier filter unit 105, so that the rectifier filter unit 105 can output the first positive voltage +Vo1.

[0078] For another example, please refer to FIG. 3D In another possible implementation, the first voltage conversion unit 10 can also adopt an isolated resonant half-bridge circuit. As shown in FIG. 3D The first voltage conversion unit 10 includes a switching unit 101b, a resonant unit 102b and a rectifier filter unit 105.

[0079] It can be understood that FIG. 3D The first voltage conversion unit 10 in FIG. 3C The circuit structure and working principle of the first voltage conversion unit 10 in FIG. 3D The structure of the switching unit 101b in FIG. 3C The structure of the switching unit 101a in FIG. 3D In FIG. 3DAs shown, the switch unit 101b includes a first power switch K1, a second power switch K2, a first capacitor C5 and a second capacitor C6. The first power switch K1 and the second power switch K2 are connected in series, and the first capacitor C5 and the second capacitor C6 are connected in series. The first power switch K1 and the second power switch K2 connected in series are connected in parallel with the first capacitor C5 and the second capacitor C6 connected in series. Specifically, the source of the first power switch K1 is connected to the drain of the second power switch K2, the drain of the first power switch K1 is connected to one end of the first capacitor C5, the other end of the first capacitor C5 is connected to one end of the second capacitor C6, and the other end of the second capacitor C6 is connected to the source of the second power switch K2. The drain of the first power switch K1 and the source of the second power switch K2 are used to connect the positive and negative poles of the negative DC power supply 2 to obtain the negative voltage -Vin. That is to say, FIG. 3D In the embodiment, the switch unit 101b is configured by replacing the third power switch K3 and the fourth power switch K4 in the switch unit 101a with the first capacitor C5 and the second capacitor C6 respectively.

[0080] It can be understood that when the first voltage conversion unit 10 is working, the first power switch K1 and the second capacitor C6 constitute a group of power switches, and the second power switch K2 and the first capacitor C5 constitute another group of power switches. Among them, the on-off states of the first power switch K1 and the second power switch K2 are opposite.

[0081] For example, in the first time period, the first power switch K1 is turned on, and the resonant network obtains the negative voltage -Vin through the turned-on first power switch K1 and the second capacitor C6, and then transmits power to the transformer T, and the transformer T transmits power to the rectifier and filter unit 105, so that the rectifier and filter unit 105 can output the first positive voltage +Vo1.

[0082] For another example, in the second time period, the second power switch K2 is turned on, and the resonant network obtains the negative voltage -Vin through the first capacitor C5 and the turned-on second power switch K2, and then transmits power to the transformer T, and the transformer T transmits power to the rectifier and filter unit 105, so that the rectifier and filter unit 105 can output the first positive voltage +Vo1.

[0083] It can be understood that in the embodiment of the present application, the plurality of power switches can use switch devices with consistent internal parameters to reduce impurity inductance and distributed capacitance.

[0084] It can be understood that in the above FIGS. 3A-3DIn the illustrated embodiment, the resonant units 102, 102a, 102b can operate at a resonant frequency, so as to realize zero voltage switching (ZVS) or zero current switching (ZCS) of the first voltage conversion unit 10, thereby reducing switching loss of the power switches, improving voltage conversion efficiency, and further improving the working efficiency and power density of the first voltage conversion unit 10.

[0085] It can be understood that, in the illustrated embodiment, the resonant units 102, 102a, 102b can operate at a resonant frequency, so as to realize zero voltage switching (ZVS) or zero current switching (ZCS) of the first voltage conversion unit 10, thereby reducing switching loss of the power switches, improving voltage conversion efficiency, and further improving the working efficiency and power density of the first voltage conversion unit 10. FIGS. 3A-3D In the illustrated embodiment, when the first voltage conversion unit 10 is working, the resonant units 102, 102a, 102b obtain negative voltage through the group of power switches that are turned on, and then transmit power to the circuit at the next stage. That is to say, the resonant units 102, 102a, 102b form a loop with the negative DC power supply 2 through the group of power switches that are turned on in the switching unit 101, 101a, 101b, so that when the group of power switches that are turned on are turned off, the voltage difference between the two ends connected to the negative DC power supply 2 in the group of power switches is a negative voltage -Vin. That is to say, the voltage applied to the group of power switches is a negative voltage -Vin. Therefore, the voltage value borne by the group of power switches is the input voltage value. While in the FIG. 1B In the illustrated BUCK-BOOST circuit, the voltage value borne by the power switch S when it is turned off (i.e. the voltage difference between the drain and the source) is the sum of the input voltage value and the output voltage value. Obviously, FIGS. 3A-3D In the illustrated embodiment, the voltage value borne by the group of power switches can be smaller. This makes the power parameters of the switching devices used by the first voltage conversion unit 10 be reduced.

[0086] It can be understood that, compared with the switching devices with large power parameters, the switching devices with small power parameters not only have faster response speed, but also have smaller power loss and smaller device size. Therefore, when the first voltage conversion unit 10 uses the switching devices with smaller power parameters, the power loss and the voltage conversion efficiency of the first voltage conversion unit 10 can be improved, and the power density can be increased. In addition, the switching devices with small power parameters have smaller cost and supply risk than the switching devices with large power parameters, so the cost and supply risk of the first voltage conversion unit 10 can be reduced.

[0087] Moreover, in the illustrated embodiment, the power switches of the switching units 101, 101a, 101b can be divided into two groups, and the two groups of power switches are turned on and turned off alternately, which is equivalent to two switching power supplies outputting power at the same time, so that the first voltage conversion unit 10 has large output power and high working efficiency. FIGS. 3A-3D

[0088] ​It can be understood that in the first embodiment of the present application, when the first voltage conversion unit 10 adopts a non-isolated resonant switched capacitor circuit, the voltage conversion module 1 can realize a DC-C power supply mode. When the first voltage conversion unit 10 adopts an isolated resonant half-bridge circuit or an isolated resonant full-bridge circuit, the voltage conversion module 1 can realize a DC-I power supply mode. Therefore, the voltage conversion module 1 can realize two power supply modes. Moreover, the voltage conversion module 1 also does not need to reserve a certain area as required by the circuit of the prior art, and thus the layout of the voltage conversion module 1 is more compact and reasonable, which can be beneficial to realize high power density. FIG. 1A

[0089] It can be understood that the first embodiment of the present application does not limit the specific circuit of each second voltage conversion unit 20, as long as each second voltage conversion unit 20 can realize step-up and / or step-down.

[0090] For example, each second voltage conversion unit 20 can adopt a boost (BOOST) circuit which can realize step-up function, a buck (BUCK) circuit which can realize step-down function, or a buck-boost (BUCK-BOOST) circuit which can realize step-down-step-up function and does not convert voltage polarity. Of course, each second voltage conversion unit 20 can also be a combination of the above circuits. For example, each second voltage conversion unit 20 can be a combination of a BUCK circuit and a BOOST circuit, a combination between a BUCK circuit and a BUCK-BOOST circuit, a combination between a BUCK circuit, a BOOST circuit and a BUCK-BOOST circuit, etc., and the first embodiment does not make specific limitation thereon.

[0091] It can be understood that the above-mentioned second voltage conversion unit 20 can be used as a post-circuit of any first voltage conversion unit 10 in the first embodiment of the present application to convert the first positive voltage +V01 into the second positive voltage +V02. FIGS. 3A-3D

[0092] For example, please refer to FIG. 4A In the first case, the second voltage conversion unit 20 includes a power switch K5, a diode VD3, a capacitor C7 and an inductor L1.

[0093] It can be understood that the power switch in the second voltage conversion unit 20 can adopt a MOSFET, an IGBT, a switching circuit formed by a plurality of MOSFETs in parallel or in series, a switching circuit formed by a plurality of IGBTs in parallel or in series, a switching circuit formed by a MOSFET and a reversed diode in parallel, or a switching circuit formed by an IGBT and a diode in parallel, and the present application does not make specific limitation thereon. For the convenience of description, the power switch is taken as a switching circuit formed by a MOSFET and a reversed diode in parallel as an example for illustration.

[0094] In​​FIG. 4A In the second case, the second voltage conversion unit 20 comprises a power switch K6, a diode VD4, a capacitor C8 and an inductor L2. Wherein, one end of the inductor L2 is connected to the output end of the first voltage conversion unit 10 to receive the first positive voltage +V01. The other end of the inductor L2 is connected to the drain of the power switch K6 and the anode of the diode VD4, and the source of the power switch K6 is connected to the output end of the first voltage conversion unit 10 and one end of the capacitor C8. The cathode of the diode VD4 is connected to the other end of the capacitor C8. The other end of the capacitor C8 serves as the output end of the second voltage conversion unit 20 to output the second positive voltage +V02. It can be understood that the gate of the power switch K6 is used to receive a control signal to turn on and off under the control of the control signal. It can be understood that the diode VD4 can also be replaced by a power switch, which is not specifically limited here.

[0095] It can be understood that, FIG. 4A When the power switch K5 is turned on, the capacitor C7 and the inductor L1 are powered, wherein the inductor L1 receives the first positive voltage +V01 output by the first voltage conversion unit 10 through the power switch K5 and stores energy. When the power switch K5 is turned off, the inductor L1 releases the energy stored before to power the capacitor C7. Since the power supply of the inductor L1 will gradually decrease, the second voltage conversion unit 20 can realize the function of voltage reduction. Wherein, +V02 = +V01 * D. D is the duty ratio of the power switch K5, that is, the proportion of the time length of the power switch K5 turned on in a cycle of the power switch.

[0096] For another example, please refer to FIG. 4B In the second case, the second voltage conversion unit 20 comprises a power switch K6, a diode VD4, a capacitor C8 and an inductor L2. Wherein, one end of the inductor L2 is connected to the output end of the first voltage conversion unit 10 to receive the first positive voltage +V01. The other end of the inductor L2 is connected to the drain of the power switch K6 and the anode of the diode VD4, and the source of the power switch K6 is connected to the output end of the first voltage conversion unit 10 and one end of the capacitor C8. The cathode of the diode VD4 is connected to the other end of the capacitor C8. The other end of the capacitor C8 serves as the output end of the second voltage conversion unit 20 to output the second positive voltage +V02. It can be understood that the gate of the power switch K6 is used to receive a control signal to turn on and off under the control of the control signal. It can be understood that the diode VD4 can also be replaced by a power switch, which is not specifically limited here.

[0097] It can be understood that, FIG. 4BThe second voltage conversion unit 20 shown in the figure works as follows. When the power switch K6 is turned on, the inductor L2 receives the first positive voltage +V01 output by the first voltage conversion unit 10 and stores energy. When the power switch K6 is turned off, the first positive voltage +V01 supplies power to the capacitor C8 through the diode VD4, and at the same time, the inductor L2 releases the energy stored previously to the capacitor C8 through the diode VD4. Thus, the second voltage conversion unit 20 can realize the function of voltage boosting. Wherein, +V02 = +V01 / (1-D). D is the duty ratio of the power switch K6, i.e. the proportion of the time length during which the power switch K6 is turned on in a cycle of the power switch.

[0098] For another example, please refer to FIG. 4C In the third case, the second voltage conversion unit 20 includes power switches K7-K10, capacitors C9 and C10, and an inductor L3. The drain of the power switch K7 is connected to the output terminal of the first voltage conversion unit 10 to receive the first positive voltage +V01. The source of the power switch K7 is connected to the drain of the power switch K8, and through the inductor L3, to the source of the power switch K9. The source of the power switch K8 is connected to the output terminal of the first voltage conversion unit 10 through the capacitor C9, and to the source of the power switch K10. The drain of the power switch K10 is connected to the source of the power switch K9, and the source of the power switch K10 is connected to one end of the capacitor C10. The other end of the capacitor C10 is connected to the drain of the power switch K9, and serves as the output terminal of the second voltage conversion unit 20 to output the second positive voltage +V02. It can be understood that the gates of the power switches K7-K10 are used to receive control signals to turn on and turn off under the control of the control signals.

[0099] It can be understood that FIG. 4C The second voltage conversion unit 20 shown in the figure works as follows. When the power switches K7 and K10 are turned on, and the power switches K9 and K8 are turned off, the inductor L3 can receive the first positive voltage +V01 output by the first voltage conversion unit 10 and store energy. When the power switches K7 and K10 are turned off, and the power switches K9 and K8 are turned on, the inductor can release the energy stored previously to the capacitor C10. Wherein, +V02 = +V01*D / (1-D). D is the duty ratio of the power switches K7 and K10 that are turned on at the same time, i.e. the proportion of the time length during which the power switches K7 and K10 are turned on at the same time in a cycle of the power switches. FIG. 4C The second voltage conversion unit 20 shown in the figure can realize voltage boosting / voltage reducing by adjusting the size of D.

[0100] It can be understood that in FIGS. 4A-4CIn the illustrated embodiment, since the first voltage conversion unit 10 in the preceding stage has already centrally performed voltage polarity conversion, the n second voltage conversion units 20 only need to boost / buck the first positive voltage +Vo1 output from the first voltage conversion circuit to a second positive voltage +Vo2, without needing to convert the voltage polarity. This allows the voltage to be switched off when the power switch in the second voltage conversion unit 20 is turned off, for example, in... FIG. 4A In the embodiment shown, when power switch K5 is turned off, the voltage difference between the drain and source is less than the first positive voltage +Vo1. FIG. 4B In the embodiment shown, when power switch K6 is turned off, the voltage difference between the drain and source is close to the second positive voltage +Vo2. FIG. 4C In the illustrated embodiment, the voltage difference between the drain and source of each power switch is less than the first positive voltage +Vo1 when it is turned off. Clearly, the voltage across the power switches in the second voltage conversion unit 20 does not exceed the input voltage or the output voltage. That is, the voltage across the switching devices in the second voltage conversion unit 20 is less than the sum of the input and output voltages.

[0101] And in FIG. 1B In the BUCK-BOOST circuit shown, the voltage across the power switch S when it is off (i.e., the voltage difference between the drain and source) is the sum of the input voltage and the output voltage. Clearly, FIGS. 4A-4C The power switch in the illustrated embodiment can withstand a smaller voltage. This allows for a reduction in the power parameters of the switching devices used in the second voltage conversion unit 20.

[0102] Since switching devices with lower power parameters have better performance, lower power loss, and smaller size compared to switching devices with higher power parameters, when the second voltage conversion unit 20 uses switching devices with lower power parameters, the power loss and voltage conversion efficiency of the second voltage conversion unit 20 can be improved, and the power density can be increased.

[0103] In addition, since the cost and supply risk of low-power switching devices are lower than those of high-power switching devices, the cost and supply risk of the second voltage conversion unit 20 are also reduced.

[0104] Please refer to it again. FIG. 2 In Embodiment 1 of this application, both the first voltage conversion unit 10 and the second voltage conversion unit 20 can be controlled by an external control circuit 4. For example, the control circuit 4 can control the first voltage conversion unit 10 in an open loop and the second voltage conversion unit 20 in a closed loop.

[0105] When the control circuit 4 controls the first voltage conversion unit 10 in an open loop, the control circuit 4 can control the switching duty ratio of the switching devices in the first voltage conversion unit 10 to be fixed, so that the first voltage conversion unit 10 outputs a first positive voltage +V01 with a fixed voltage value. For example, the control circuit 4 can control the switching duty ratio of the switching devices (e.g., the first to fourth power switches K1-K4) in the first voltage conversion unit 10 to be fixed at about 50%, so that the voltage value of the first positive voltage +V01 output by the first voltage conversion unit 10 is equal to the voltage value of the negative voltage -Vin.

[0106] When the control circuit 4 controls each of the second voltage conversion units 20 in a closed loop, the control circuit 4 can dynamically adjust the switching duty ratio or the switching frequency of the switching devices in each of the second voltage conversion units 20 according to the voltage output by the second voltage conversion unit 20, so as to adjust the voltage value of the second positive voltage +V02 output by each of the second voltage conversion units 20 to a preset voltage value. In this way, it can be ensured that the second positive voltage +V02 meets the required supply voltage of the load 3, and more reliable power supply is achieved.

[0107] It can be understood that, as described above, the first voltage conversion unit 10 in the first voltage conversion unit 10 is operated in an open loop and does not need to be adjusted in a closed loop. Therefore, the working efficiency of the entire voltage conversion module 1 can be improved.

[0108] It can be understood that the control circuit 4 can be a general central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the program execution of the above scheme.

[0109] It can be understood that the control circuit 4 can generate control signals based on a Pulse Width Modulation (PWM) mode, a Pulse Frequency Modulation (PFM) mode, or a mixed PWM and PFM mode, to drive the switching devices in the first voltage conversion unit 10 and the second voltage conversion unit 20 to turn on or turn off. For example, the switching devices in the first voltage conversion unit 10 and the second voltage conversion unit 20 turn on when receiving a high level in the control signal, and turn off when receiving a low level in the control signal.

[0110] Further, the control circuit 4 can generate the control signal based on a PWM mode. When the control circuit 4 controls the second voltage conversion unit 20 in a closed loop, the pulse width of the control signal can be adjusted according to the difference between the voltage output by the second voltage conversion unit 20 and the second positive voltage +Vo2 required by the load, and then the second voltage conversion unit 20 adjusts the duty cycle of the switching device based on the adjusted control signal, and then adjusts the voltage output by the second voltage conversion unit 20.

[0111] In summary, the voltage conversion module 1 of the embodiment of the present application can first perform voltage polarity conversion by the first voltage conversion unit 10, and then adjust the first positive voltage +Vo1 to the corresponding second positive voltage +Vo2 by the n second voltage conversion units 20. Based on this design, the voltage value borne by the switching device in the first voltage conversion unit 10 and the switching device in the second voltage conversion unit 20 can be less than the sum of the input voltage value and the output voltage value. Compared with the BUCK-BOOST circuit shown in the prior art, the power parameters of the switching devices used in the first voltage conversion unit 10 and the n second voltage conversion units 20 of the embodiment of the present application can be smaller. FIG. 1B In summary, the voltage conversion module 1 of the embodiment of the present application can first perform voltage polarity conversion by the first voltage conversion unit 10, and then adjust the first positive voltage +Vo1 to the corresponding second positive voltage +Vo2 by the n second voltage conversion units 20. Based on this design, the voltage value borne by the switching device in the first voltage conversion unit 10 and the switching device in the second voltage conversion unit 20 can be less than the sum of the input voltage value and the output voltage value. Compared with the BUCK-BOOST circuit shown in the prior art, the power parameters of the switching devices used in the first voltage conversion unit 10 and the n second voltage conversion units 20 of the embodiment of the present application can be smaller.

[0112] When the first voltage conversion unit 10 and the n second voltage conversion units 20 both use switching devices with smaller power parameters, the power loss and volume of the first voltage conversion unit 10 and the n second voltage conversion units 20 can be effectively reduced, because the power loss of the switching device with a small power parameter is less than that of the switching device with a large power parameter, and the volume is also smaller. Since both the power loss and the volume are small, the power density can be improved, and thus the power density of the voltage conversion module 1 in the embodiment of the present application can be effectively improved.

[0113] In addition, the reaction speed of the switching device with a small power parameter can be faster than that of the switching device with a large power parameter, and thus when the first voltage conversion unit 10 and the n second voltage conversion units 20 both use switching devices with smaller power parameters, the working efficiency of the first voltage conversion unit 10 and the n second voltage conversion units 20 can also be higher. Moreover, the first voltage conversion unit 10 in the front stage can work in an open loop without closed loop adjustment, further improving the working efficiency. Therefore, the efficiency of the entire voltage conversion module 1 can be effectively improved.

[0114] The voltage conversion module 1 takes -48V DC voltage as the input, and takes +12V, +28V, +50V and +65V as the output. When the first voltage conversion unit 10 adopts a non-isolated resonant switching capacitor circuit, and the four second voltage conversion units 20 respectively adopt two BUCK circuits, one BOOST circuit and one BUCK-BOOST circuit, the non-isolated resonant switching capacitor circuit can convert -48V into +48V, and the conversion efficiency can reach 99%. The two BUCK circuits, the one BOOST circuit and the one BUCK-BOOST circuit can respectively convert +48V into +12V, +28V, +50V and +65V, and the conversion efficiencies can respectively reach 98%, 98.5%, 98% and 99%. Therefore, the conversion efficiencies of the voltage conversion module 1 for converting -48V into +12V, +28V, +50V and +65V are finally 97%, 97.5%, 98% and 97% respectively. As can be seen, the voltage conversion efficiency of the voltage conversion module 1 is not less than 97%. Compared with the BUCK-BOOST circuit in FIG. 1B , the voltage conversion efficiency of the voltage conversion module 1 for converting -48V into +12V, +28V, +50V and +65V can be 1-2% higher than the voltage conversion efficiency of the BUCK-BOOST circuit in FIG. 1B .

[0115] When the first voltage conversion unit 10 adopts an isolated resonant full-bridge circuit, and the four second voltage conversion units 20 respectively adopt two BUCK circuits, one BOOST circuit and one BUCK-BOOST circuit, the isolated resonant full-bridge circuit can convert -48V into +48V, and the conversion efficiency can reach 97.5%. The two BUCK circuits, the one BUCK-BOOST circuit and the one BOOST circuit can respectively convert +48V into +12V, +28V, +50V and +65V, and the conversion efficiencies can respectively reach 98%, 98.5%, 98% and 99%. Therefore, the conversion efficiencies of the voltage conversion module 1 for converting -48V into +12V, +28V, +50V and +65V are finally 95.5%, 96%, 96.5% and 95.5% respectively. As can be seen, the voltage conversion efficiency of the voltage conversion module 1 is more than 95%. Compared with the circuit in FIG. 1A , the voltage conversion efficiency of the voltage conversion module 1 for converting -48V into +12V, +28V, +50V and +65V can be 2.5-3% higher than the voltage conversion efficiency of the circuit in FIG. 1A . As can be seen, the voltage conversion module 1 in the embodiment one of the present application can achieve higher efficiency.

[0116] In addition, the first voltage conversion unit 10 and the n second voltage conversion units 20 in the embodiment one of the present application constitute a two-stage circuit, which is different from the circuit in FIG. 1BThe voltage conversion module 1 of the embodiment one of the present application has more dispersed heat production, and can reduce the problem of high temperature burnout of devices caused by concentrated heat production.

[0117] In addition, the first voltage conversion unit 10 of the embodiment one of the present application can be flexibly selected according to actual conditions FIGS. 3A-3D , and the second voltage conversion unit 20 can also be flexibly selected according to actual conditions FIGS. 4A-3B , that is, any one circuit or combination of circuits in , so that the voltage conversion module 1 of the embodiment one of the present application can be more flexible and have stronger applicability.

[0118] Embodiment two

[0119] Please refer to FIG. 5 , FIG. 5 , which shows a schematic diagram of a voltage conversion module provided by the embodiment two of the present application.

[0120] As shown in FIG. 5 , the voltage conversion module 1a includes a first voltage conversion unit 10 and a second voltage conversion unit 20. The connection relationship, specific circuit and working process of the first voltage conversion unit 10 and the second voltage conversion unit 20 are the same as those of the embodiment one, and will not be described here.

[0121] The voltage conversion module 1a of the embodiment two is different from the voltage conversion module 1 of the embodiment one in that the voltage conversion module 1a of the embodiment two further includes a centralized control unit 30.

[0122] In the embodiment two, the centralized control unit 30 is electrically connected with the first voltage conversion unit 10 and the n second voltage conversion units 20. The centralized control unit 30 can perform open-loop control on the first voltage conversion unit 10 and closed-loop control on the n second voltage conversion units 20.

[0123] It can be understood that the circuit and control process of the centralized control unit 30 are the same as or similar to those of the control circuit 4 in the embodiment one, and will not be described here.

[0124] Embodiment three

[0125] Please refer to FIG. 6 , FIG. 6 , which shows a schematic diagram of a voltage conversion module provided by the embodiment three of the present application.

[0126] As shown in FIG. 6 , the voltage conversion module 1b includes a first voltage conversion unit 10 and a second voltage conversion unit 20. The connection relationship, specific circuit and working process of the first voltage conversion unit 10 and the second voltage conversion unit 20 are the same as those of the embodiment one, and will not be described here.

[0127] The voltage conversion module 1b of the third embodiment is different from the voltage conversion module 1 of the first embodiment in that the voltage conversion module 1b of the third embodiment further comprises a first control unit 40 and m second control units 50, m being a positive integer.

[0128] In the third embodiment, the first control unit 40 is electrically connected to the first voltage conversion unit 10, and the first control unit 40 is configured to open-loop control the first voltage conversion unit 10 to output the first positive voltage +Vo1.

[0129] It can be understood that the circuit of the first control unit 40 and the process of open-loop control of the first voltage conversion unit 10 by the first control unit 40 are the same as or similar to those of the control circuit 4 in the first embodiment, and will not be described here.

[0130] The m second control units 50 are respectively electrically connected to corresponding ones of the n second voltage conversion units 20, and the m second control units 50 are respectively configured to close-loop control corresponding ones of the n second voltage conversion units 20 to output the second positive voltage +Vo2.

[0131] It can be understood that m can be less than or equal to n. That is, when m is equal to n, one second control unit 50 controls a corresponding one of the second voltage conversion units 20. When m is less than n, the second control units 50 and the second voltage conversion units 20 can be in one-to-one correspondence, and one second control unit 50 can control one or more corresponding second voltage conversion units 20.

[0132] It can be understood that the circuit of the second control unit 50 and the process of close-loop control of the second control unit 50 by the second control unit 50 are the same as or similar to those of the control circuit 4 in the first embodiment, and will not be described here.

[0133] The fourth embodiment:

[0134] Please refer to FIG. 7 , FIG. 7 a schematic diagram of a voltage conversion module provided by the fourth embodiment of the present application is shown.

[0135] As FIG. 7 shown, the voltage conversion module 1c comprises a first voltage conversion unit 10 and a second voltage conversion unit 20. The connection relationship, specific circuit and working process of the first voltage conversion unit 10 and the second voltage conversion unit 20 are the same as those of the first embodiment, and will not be described here.

[0136] The voltage conversion module 1c of the fourth embodiment is different from the voltage conversion module 1 of the first embodiment in that the voltage conversion module 1c of the fourth embodiment further comprises a first control unit 40 and a centralized control unit 30.

[0137] In the fourth embodiment, the first control unit 40 is electrically connected to the first voltage conversion unit 10, and the first control unit 40 is configured to perform open-loop control on the first voltage conversion unit 10.

[0138] It can be understood that the circuit of the first control unit 40 and the process of open-loop control on the first voltage conversion unit 10 are the same as or similar to the control circuit 4 in the first embodiment, and thus will not be described herein.

[0139] The centralized control unit 30 is electrically connected to the n second voltage conversion units 20, and the centralized control unit 30 is configured to perform closed-loop control on each second voltage conversion unit 20.

[0140] It can be understood that the circuit of the centralized control unit 30 and the process of closed-loop control on the second control unit 50 are the same as or similar to the control circuit 4 in the first embodiment, and thus will not be described herein.

[0141] It can be understood that the embodiments of the present application further provide a power supply system.

[0142] Referring to FIG. 8 , a schematic diagram of a power supply system according to an embodiment of the present application is shown. As FIG. 8 shown, the power supply system 100 includes a negative DC power supply 2 and a voltage conversion module 1d.

[0143] The voltage conversion module 1d is electrically connected to the negative DC power supply 2 and a load 3, and the voltage conversion module 1d is configured to convert a negative voltage -Vin provided by the negative DC power supply 2 into a power supply voltage +Vo2 required by the load 3.

[0144] It can be understood that the negative DC power supply 2 can be an alternating current / direct current (AC / DC) conversion circuit, which can convert alternating current (for example, 220V mains) into negative DC. The negative DC power supply 2 can also be a battery (BATT), which will not be specifically limited herein.

[0145] It can be understood that the voltage conversion module 1d can be the voltage conversion module 1, 1a, 1b, or 1c described in the above first to fourth embodiments, and specific descriptions can be referred to FIGS. 3A-7 , which will not be described herein.

[0146] It can be understood that the embodiments of the present application further provide a base station.

[0147] Referring to FIG. 9 , a schematic diagram of a base station 200 according to an embodiment of the present application is shown. As FIG. 9As shown, the base station 200 comprises a remote radio unit (RRU) 5, a bandwidth based unit (BBU) 6, an antenna 7, a feeder 8 and a power supply system 100a.

[0148] The remote radio unit 5 is in communication connection with the remote radio unit 5 through an optical fiber, and the remote radio unit 5 is connected with the antenna 7 through the feeder 8. It can be understood that the remote radio unit 5 can receive digital signals and control information from the bandwidth based unit 6, the remote radio unit 5 modulates the digital signals into radio frequency signals and amplifies them, and then transmits the amplified radio frequency signals to the antenna 7 through the feeder 8, and the antenna 7 transmits the radio frequency signals. The remote radio unit 5 can also receive radio frequency signals from the antenna 7 through the feeder 8, demodulate the radio frequency signals, and transmit the demodulated signals to the bandwidth based unit 6, and the bandwidth based unit 6 processes the demodulated signals returned by the bandwidth based unit 6.

[0149] The power supply system 100a connects the remote radio unit 5 and / or the bandwidth based unit 6 through a cable, and the remote radio unit 5 (RRU) and / or the bandwidth based unit 6 (BBU) are loads of the power supply system 100, and the power supply system 100a can provide corresponding power supply voltage for the remote radio unit 5 and / or the bandwidth based unit 6.

[0150] It can be understood that the power supply system 100a can provide power supply for the remote radio unit 5 and / or the bandwidth based unit 6. FIG. 8 As shown in the power supply system 100.

[0151] It can be understood that the installation position of the power supply system 100a can be the same as the remote radio unit 5 or the bandwidth based unit 6, which is not limited here and can be set according to the needs of the application scene. For example, FIG. 9 As shown, the base station is a distributed base station. Among them, the remote radio unit 5, the antenna 7 and the feeder 8 can be installed on the top of the tower body 9. Of course, the remote radio unit 5, the antenna 7 and the feeder 8 can also be installed on a high mountain, on the roof or other high places. The power supply system 100a and the bandwidth based unit 6 are installed at the bottom of the tower body 9 or in a machine room far away.

[0152] For example, when the tower body 9 is provided with the radio frequency unit 5 containing four power amplifier circuits of different frequency bands, and the radio frequency unit 5 needs 12V, 28V, 50V and 65V power supply voltages, the power supply system 100a can first convert the negative voltage -Vin (for example, -48V DC voltage, with a fluctuation range of -36V to -63V) provided by the negative DC power supply 2 into a first positive voltage +Vo1 (for example, +48V DC voltage), and then convert the first positive voltage +Vo1 into a plurality of second positive voltages +Vo2, which are 12V, 28V, 50V and 65V respectively. The plurality of second positive voltages +Vo2 can be transmitted to the corresponding power amplifier circuits of the radio frequency unit 5 through cables respectively. After the power amplifier circuits of the radio frequency unit 5 obtain the power supply voltages, they can be powered on and work normally.

[0153] It can be understood that the embodiments of the present application also provide a radio frequency module. Please refer to FIG. 10 The radio frequency module 300 can include the voltage conversion module 1e and the radio frequency unit 5a. The voltage conversion module 1e is electrically connected to the radio frequency unit 5a to supply power for the radio frequency unit 5a.

[0154] It can be understood that the structure and working process of the radio frequency unit 5a can refer to the description of the radio frequency unit 5 in the base station as described above FIG. 9 , which will not be repeated here.

[0155] It can be understood that the voltage conversion module 1e can be the voltage conversion module 1, 1a, 1b and 1c described in the above embodiments one to four, and the specific description can refer to FIGS. 3A-7 , which will not be repeated here.

[0156] It can be understood that the embodiments of the present application also provide a baseband module.

[0157] Please refer to FIG. 11 The baseband module 400 can include the voltage conversion module 1f and the baseband unit 6a. The voltage conversion module 1f is electrically connected to the baseband unit 6a to supply power for the baseband unit 6a.

[0158] It can be understood that the working process of the baseband unit 6a can refer to the description of the baseband unit 6 in the base station as described above FIG. 9 , which will not be repeated here.

[0159] It can be understood that the voltage conversion module 1f can be the voltage conversion module 1, 1a, 1b and 1c described in the above embodiments one to four, and the specific description can refer to FIGS. 3A-7 , which will not be repeated here.

[0160] The functional units in the embodiments of the present application can be integrated in one processing unit, or each unit can be a separate unit, or two or more units can be integrated in one unit; the integrated unit can be implemented in the form of hardware, or in the form of hardware and software function units.

[0161] The integrated unit of the present application, if implemented in the form of software function modules and sold or used as an independent product, can also be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods of the embodiments of the present application. The foregoing storage medium includes: a mobile storage device, a ROM, a RAM, a magnetic disk or an optical disk, and various media that can store program codes.

[0162] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A voltage conversion module, characterized in that, The voltage conversion module includes a first voltage conversion unit and n second voltage conversion units, where n is a positive integer. The first voltage conversion unit includes a switching unit and a resonant unit. The switching unit includes two sets of power switches with opposite on / off states. The resonant unit is electrically connected to the switching unit and is used to obtain a negative voltage through the on set of the two sets of power switches, and then convert the negative voltage into a first positive voltage. The n second voltage conversion units are electrically connected to the resonant unit. Each of the n second voltage conversion units is used to receive the first positive voltage and adjust the first positive voltage to a second positive voltage.

2. The voltage conversion module as described in claim 1, characterized in that, The switching unit includes a first power switch, a second power switch, a third power switch, and a fourth power switch, wherein the first power switch, the second power switch, the third power switch, and the fourth power switch are connected in series, and the resonant unit is connected in parallel with the series-connected second power switch and the third power switch; The intermediate node between the second power switch and the third power switch, as well as one end of the fourth power switch, are used to receive the negative voltage. One end of the first power switch is used to connect to the second voltage conversion unit to output the first positive voltage to the second voltage conversion unit. The first power switch and the third power switch constitute one of the two sets of power switches, and the second power switch and the fourth power switch constitute the other set of the two sets of power switches. The resonant unit is used to obtain the negative voltage and charge through the conducting second power switch and the fourth power switch. The resonant unit is also used to discharge to the second voltage conversion unit through the conducting first power switch and the third power switch.

3. The voltage conversion module as described in claim 1, characterized in that, The switching unit includes a first power switch, a second power switch, a third power switch, and a fourth power switch, which are connected in series. The resonant unit includes a resonant capacitor and a resonant inductor. The resonant capacitor is connected in parallel with the series-connected second and third power switches. One end of the resonant inductor is connected to the intermediate node between the second and third power switches, and the other end is electrically connected to one end of the first power switch that is connected to the second voltage conversion unit. The intermediate node between the second power switch and the third power switch, as well as one end of the fourth power switch, are used to receive the negative voltage. One end of the first power switch is used to connect to the second voltage conversion unit to output the first positive voltage to the second voltage conversion unit. The first power switch and the third power switch constitute one of the two sets of power switches, and the second power switch and the fourth power switch constitute the other set of the two sets of power switches. The resonant unit is used to obtain the negative voltage and charge through the conducting second power switch and the fourth power switch. The resonant unit is also used to discharge to the second voltage conversion unit through the conducting first power switch and the third power switch.

4. The voltage conversion module as described in claim 1, characterized in that, The switching unit includes a first power switch, a second power switch, a third power switch, and a fourth power switch. The first power switch and the second power switch are connected in series, and the third power switch and the fourth power switch are connected in series. The first power switch and the second power switch connected in series are connected in parallel with the third power switch and the fourth power switch connected in series. One end of the first power switch connected to the third power switch and one end of the second power switch connected to the fourth power switch are used to receive the negative voltage. The resonant unit includes a transformer and a resonant network. One end of the transformer is connected to the intermediate node between the first power switch and the second power switch and the intermediate node between the third power switch and the fourth power switch through the resonant network. The other end of the transformer is used to electrically connect to the second voltage conversion unit to output the first positive voltage to the second voltage conversion unit. The first power switch and the fourth power switch constitute one of the two sets of power switches, and the second power switch and the third power switch constitute the other set of the two sets of power switches. The resonant network is used to obtain the negative voltage through the first set of power switches or the second set of power switches that are turned on, and then transmit electrical energy to the second voltage conversion unit through the transformer.

5. The voltage conversion module as described in claim 1, characterized in that, The switching unit includes a first power switch, a second power switch, a first capacitor, and a second capacitor. The first power switch and the second power switch are connected in series, and the first capacitor and the second capacitor are connected in series. The first power switch and the second power switch connected in series are connected in parallel with the first capacitor and the second capacitor connected in series. One end of the first power switch connected to the first capacitor and one end of the second power switch connected to the second capacitor are used to receive the negative voltage. The resonant unit includes a transformer and a resonant network. One end of the transformer is connected to the intermediate node of the first power switch and the second power switch and the intermediate node of the first capacitor and the second capacitor through the resonant network. The other end of the transformer is used to electrically connect to the second voltage conversion unit to output the first positive voltage to the second voltage conversion unit. The first power switch and the second capacitor constitute one of the two sets of power switches, and the second power switch and the first capacitor constitute the other set of the two sets of power switches. The resonant network is used to obtain the negative voltage through the first set of power switches or the second set of power switches that are turned on, and then transmit electrical energy to the second voltage conversion unit through the transformer.

6. The voltage conversion module as described in any one of claims 1 to 5, characterized in that, The first voltage conversion unit operates in an open-loop state, and the second voltage conversion unit operates in a closed-loop state. When the first voltage conversion unit is in open-loop operation, the switching duty cycle of the power switch in the first voltage conversion unit is fixed, and the output voltage value of the first voltage conversion unit is the first positive voltage with a fixed value. When each second voltage conversion unit is in closed-loop operation, the switching duty cycle or switching frequency of the power switch in each second voltage conversion unit is adjustable, and the output voltage value of each second voltage conversion unit is an adjustable second positive voltage.

7. The voltage conversion module as described in any one of claims 1 to 5, characterized in that, The voltage conversion module further includes a centralized control unit, which is electrically connected to the first voltage conversion unit and each of the second voltage conversion units. The centralized control unit is used for open-loop control of the first voltage conversion unit to output the first positive voltage and for closed-loop control of each of the second voltage conversion units to output the second positive voltage.

8. The voltage conversion module as described in any one of claims 1 to 5, characterized in that, The voltage conversion module further includes a first control unit and a centralized control unit. The first control unit is electrically connected to the first voltage conversion unit and is used for open-loop control of the first voltage conversion unit to output the first positive voltage. The centralized control unit is electrically connected to the second voltage conversion unit, and the centralized control unit is used for closed-loop control of the output of the second positive voltage of each second voltage conversion unit.

9. The voltage conversion module as described in any one of claims 1 to 5, characterized in that, The first voltage conversion unit includes a first control unit and m second control units, where m is a positive integer, less than or equal to n. The first control unit is electrically connected to the first voltage conversion unit, and the first control unit is used for open-loop control of the first voltage conversion unit to output the first positive voltage; The m second control units are each electrically connected to one of the n second voltage conversion units, and the m second control units are used for closed-loop control of the output of the second positive voltage of one of the n second voltage conversion units.

10. The voltage conversion module as described in claim 1, characterized in that, Each of the n second voltage conversion units includes a boost converter circuit, a buck converter circuit, and / or a buck-boost converter circuit.

11. A power supply system, characterized in that, The power supply system includes a negative DC power supply and a voltage conversion module as described in any one of claims 1 to 10, wherein the voltage conversion module is electrically connected to the negative DC power supply and is used to obtain a negative voltage from the voltage conversion module.

12. A base station, characterized in that, The base station includes the power supply system as described in claim 11.

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